diff --git a/[refs] b/[refs]
index 4818bcc1c31b..eef0df1caff4 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9abdc4cd8a81a3c29e051eb12963757ac60bd440
+refs/heads/master: f668ab1acc05fc3f525b97db613b2d1f99efd957
diff --git a/trunk/include/linux/idr.h b/trunk/include/linux/idr.h
index 7fb3ff9c7b0e..d37c8d808b0f 100644
--- a/trunk/include/linux/idr.h
+++ b/trunk/include/linux/idr.h
@@ -8,6 +8,10 @@
  * Small id to pointer translation service avoiding fixed sized
  * tables.
  */
+
+#ifndef __IDR_H__
+#define __IDR_H__
+
 #include <linux/types.h>
 #include <linux/bitops.h>
 
@@ -77,3 +81,5 @@ int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id);
 void idr_remove(struct idr *idp, int id);
 void idr_destroy(struct idr *idp);
 void idr_init(struct idr *idp);
+
+#endif /* __IDR_H__ */